Relief-valve.



RELIEF VALVE. APPLICATION men MA'Y4.1 914.

Patented May 4, 191 5.

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aoLvIu s. WHITNEY, or tnwxsr'ou, MAiINE.

RELIEF-VALVE.

Specification of Letters Patent.

Application filed May 4, 1914. Serial No. 886,154.

To all whom it may concern v Be it known that I, Ronvnv S. WHITNEIY, of Lewiston, in the county of Androscoggin and State of Maine, have invented certain new and useful Improvements. in Relief- Valves, of which the following is a specifi- My invention relates to relief valves designed to be used for any purposefor which such valves are used but particularly designed to he used in connection with steam traps which. discharge through a relief valve. The object of my invention is to construct a relief valve in which the valve is practically sure of being tight, and in which the tension on the valve may be accurately adjusted, the adjusting means being inside the valve and being provided with ameans by which any accidental change of adjustment is prevented. 5

The invention consists of the combination and arrangement of parts hereinafter set forth and claimed.

My invention may best be understood by reference to the accompanying drawing, in whicha Figure 1 1s a central longitudinal section through a valve constructed according to my invention, Fig. 2 is a section on the line m m of Fig. 1, and Fig. 3 is a section oirthe line 7 3 of Fig. 1.

The valve is made up with the usual casing A one end being formed into a screw threaded nipple a through which extends the inlet opening a.whicl1 is terminated by a valve seat (1?. The casing is also if: rmed with a discharge opening a preferalily at one side of the valve and at the end opposite the inlet opening there is a screw plug opening a.

A valve 5 fits in the valve seat and it has a cylindrical guide I) which extends into the inlet opening and is in contact with the walls thereof. The guide 1) is provided with slots which allow of the free passage of steam or other fluid.

In the end of the casing opposite to the valve 6 is a screw plug 0 fitting in the opening a and provided at its inner end with a screw threaded extension 0 upon which is an adjusting nut d. A central opening.

I) extends-from the inner end of the exten- 7 plug parallel with It is forced inwardly by a spiral spring and it has a rounded inner end which snaps into sion 0 into the screw plug and in this open- Patented May 4, 1915.

ing fits the valvespindle bconnected with the valve 6.

Interposed between the nut d and the valve is the tension. spring 6, the tension of which is adjusteclby screwing the-put out I or'in on the screw threadedextension 0'.

Means are provided for preventing the adjusting screw from accidentally turning and thus changing the As here shown I provide a pin or detent f which is contained in a hole bored in the the axis of the spindle,

one of the series of shallow recesses g tension of thespring.

formed on the sunfaceof the nut d. These recesses are arranged in a ring about the nut and at sulliciently close intervals so that the spring 6 may be adjusted with sufficient accuracy while the detentengages one of the recesses 9.

To relieve the steam pressure which would otherwise force the spindle binto the recess b I provide a duct a which connects the interior of the valve with the recess 1)". The steam entering through the duct a counteracts the pressure on the lower portion of the spindle 6 The opening a is slightly larger than the valve 6 so that the valve and all of its connections may be taken out through the end of the casing.

It will be seen that a relief valve constructed in accordance with my invention may be accurately set sired pressure within fixed limits and when the adjusting nut is once set it cannot 'be tampered with or moved accidentally since the detent keeps it from turning except when a considerable pressure is applied. When it is desired to remove the partsof the valve for any purpose the plug 0 is unscrewed and the valve, spring, nut, etc, come out through the opening at.

I claim In a relief valve, the combination of a casing having formed therein an inlet.open-' ing, a valve seat adjacent to said opening, a discharge opening, and a screw plug open-- to open at any deing, a valve-fitting said valve seat having 1 guides extending into the inlet opening and guided by the walls thereof,. a screw plug fitting said screw plug opening, said plug and a spiral spring interposed between said 10 having a screw threaded extension and a nut and said valve.

cenfigral spindle opening extending partially In testimony whereof I have afiixed my thrqugh the plug, a valve spindle on said signature in presence of two witnesses. valve extending into said spindle opening,

an adjusting nut on said extension having ROLVIN WHITNEY a series of shallow cavities, a spring pressed Witnesses: detent in said plug having a rounded end EMERY P. DAVIS,

adaptedto snap into and out of said cavities CHARLES E. DARLING. 

